Why is the delay in electrical conduction between the atria and the ventricles important? Tachycardia results if the delay is absent. Atria must contract to fill the ventricles with blood. AV valves must have time to close slowly. Bradycardia results if the delay is absent.

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A: d-allow a slow depolarization that eventually reaches the threshold for voltage-gated Ca2+ channels.

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A: Decrease in Heart rate - Bradycardia. Increase in heart rate = Tachycardia.

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Q: potential

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